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scroll-region: don't clear damage queue when changing scroll region

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Vim, for example, changes the scroll region every time you scroll a
single line. Thus, resetting the damage queue is slow.

This reworks the damage handling of scroll updates:

* Split damage queue into two: one for scroll operations and one for
  update/erase operations.
* Don't separate update/erase operations inside/outside the scroll
  region
* Store the current scroll region in the scroll damage operation. This
  allows us to stack multiple scroll operations with different scroll
  regions.
* When updating update/erase operations after a scroll operation,
  split the update/erase operations if necessary (the current scroll
  operation may have a scroll region different from before, thus
  forcing us to split existing update/erase operations.
* The renderer no longer erases after a scroll. The scroll operation
  also adds an erase operation. This also means that erase operation
  are subject to adjustments by later scroll operations.
This commit is contained in:
Daniel Eklöf 2019-06-25 20:11:08 +02:00
parent 0f76f4190a
commit a35738d96f
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GPG key ID: 5BBD4992C116573F
6 changed files with 170 additions and 210 deletions
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10
grid.h
View file

@ -2,10 +2,12 @@
#include "terminal.h"
void grid_damage_all(struct grid *grid);
void grid_damage_update(struct grid *grid, int start, int length);
void grid_damage_erase(struct grid *grid, int start, int length);
void grid_damage_scroll(
struct grid *grid, enum damage_type damage_type, int offset, int lines);
struct grid *grid, enum damage_type damage_type,
struct scroll_region region, int lines);
void grid_erase(struct grid *grid, int start, int end);
@ -18,8 +20,10 @@ void grid_cursor_down(struct grid *grid, int count);
void grid_scroll(struct grid *grid, int rows);
void grid_scroll_reverse(struct grid *grid, int rows);
void grid_scroll_partial(struct grid *grid, int offset, int rows);
void grid_scroll_reverse_partial(struct grid *grid, int offset, int rows);
void grid_scroll_partial(
struct grid *grid, struct scroll_region region, int rows);
void grid_scroll_reverse_partial(
struct grid *grid, struct scroll_region region, int rows);
int grid_cursor_linear(const struct grid *grid, int row, int col);